<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script> 
         //do while循环语句
         var num=5;
         do{
             console.log(num);//输出结果为：5和4
             num--;
         }while(num>3);
         </script>
</head>
<body>
    
</body>
</html>